doc/faq.texi      | 5 +++--
 doc/features.texi | 5 +++--
 doc/news.texi     | 4 ++++
 inode.go          | 4 ++++
 main.go           | 1 +
 ood.go            | 2 +-
 usage.go          | 4 +++-

diff --git a/doc/faq.texi b/doc/faq.texi
index 72555885f5a3c11e4dc55bdc06bcc6a561c7ca72916dc7561f2825ad9b0bc616..5d9245898ee74730d405bdbb446d483d1401a972b0259f1eaf4b55cc6edc6efc 100644
--- a/doc/faq.texi
+++ b/doc/faq.texi
@@ -4,8 +4,9 @@
 @anchor{Stamping}
 @section Hashing and stamping
 
-All targets are checksummed if their @file{ctime} differs from the
-previous one. @command{apenwarr/redo} gives
+All targets are checksummed if no @env{REDO_INODE_NO_TRUST} environment
+variable is set and target's @file{ctime} differs from the previous one.
+@command{apenwarr/redo} gives
 @url{https://redo.readthedocs.io/en/latest/FAQImpl/#why-not-always-use-checksum-based-dependencies-instead-of-timestamps, many reasons}
 why every time checksumming is bad, but in my opinion in practice all of
 them do not apply.
diff --git a/doc/features.texi b/doc/features.texi
index 07a16737169242406547ae532b611ebf6d0b95a0fdbbcad1261cace3686799ed..9f0c4bb577f49b07faf3fa843e4884030f56d1a167ed4569991a9dafe4d51a85 100644
--- a/doc/features.texi
+++ b/doc/features.texi
@@ -12,8 +12,9 @@       the redo, preventing its overwriting, but continuing the build
     @end itemize
 @item targets, dependency information and their directories are explicitly
   synced (can be disabled, should work faster)
-@item file's change is detected by comparing its size, @code{ctime}
-    and BLAKE3 hash
+@item file's change is detected by comparing its size, @code{ctime} (if
+    @env{REDO_INODE_NO_TRUST} environment variable is not set) and
+    BLAKE3 hash
 @item files creation is @code{umask}-friendly (unlike @code{mkstemp()}
     used in @command{redo-c})
 @item parallel build with jobs limit, optionally in infinite mode
diff --git a/doc/news.texi b/doc/news.texi
index 43c1527524e79c0eb28a4c3700dac750277bb429aca3401c63487424f87628f2..b859a7392b783fee8314ac9da96d635d7afb93619c8a5910248e26fb7b2f078f 100644
--- a/doc/news.texi
+++ b/doc/news.texi
@@ -8,6 +8,10 @@ @item
     @code{Size} is stored in the state, for faster OOD detection.
     Previous @command{goredo} state files won't work.
 @item
+    Setting of @env{REDO_INODE_NO_TRUST} environment variable brings no
+    trust to file inode's information (except for its size), forcing its
+    checksum checking.
+@item
     @command{redo-whichdo} resembles @code{apenwarr/redo}'s one behaviour more.
 @end itemize
 
diff --git a/inode.go b/inode.go
index c6e5fa0b7d4ba767ee6b0e2c360bb7c98f42334ca9fd35adfc6d1ef77e337879..1d7a0c1cbd5209d4365aeac7cbbc9de50db69eb34baa8ef7ffc2c1d905b68ac0 100644
--- a/inode.go
+++ b/inode.go
@@ -28,6 +28,10 @@ 	"go.cypherpunks.ru/recfile"
 	"golang.org/x/sys/unix"
 )
 
+const EnvInodeNoTrust = "REDO_INODE_NO_TRUST"
+
+var InodeTrust bool = false
+
 type Inode struct {
 	Size      int64
 	CtimeSec  int64
diff --git a/main.go b/main.go
index 6f966d760a652c37d7fd9690342e7f98b15b73ccc850a82d4edc0ca07b2b53de..a8ef0c03fad97a0d5c244b48e981aefb073b917f2e0d6276c717392aa13f46f5 100644
--- a/main.go
+++ b/main.go
@@ -101,6 +101,7 @@ 	}
 
 	NoColor = os.Getenv(EnvNoColor) != ""
 	NoSync = os.Getenv(EnvNoSync) == "1"
+	InodeTrust = os.Getenv(EnvInodeNoTrust) == ""
 
 	TopDir = os.Getenv(EnvTopDir)
 	if TopDir == "" {
diff --git a/ood.go b/ood.go
index a396c6145e2aaf364a16fb73ffe650ca7499b6da5fc779d807f769968876981b..141e0e912eea86c37a8127ae90350f23349d7a6ca306b866c843a622ceb10644 100644
--- a/ood.go
+++ b/ood.go
@@ -139,7 +139,7 @@ 			trace(CDebug, "ood: %s%s -> %s: size differs", indent, tgtOrig, dep)
 			ood = true
 			goto Done
 		}
-		if inode.Equals(theirInode) {
+		if InodeTrust && inode.Equals(theirInode) {
 			trace(CDebug, "ood: %s%s -> %s: same inode", indent, tgtOrig, dep)
 		} else {
 			trace(CDebug, "ood: %s%s -> %s: inode differs", indent, tgtOrig, dep)
diff --git a/usage.go b/usage.go
index afc420b68a3acb715458a193000ae4cddf77c461aacda240fd097e211294c7ce..8295e62555c0c69876f5bba29cc428c2f352d00c6c8c6839e4279e91949fcf03 100644
--- a/usage.go
+++ b/usage.go
@@ -91,5 +91,7 @@ Additional environment variables:
   NO_COLOR -- disable messages colouring
   REDO_NO_SYNC -- disable files/directories explicit filesystem syncing
   REDO_TOP_DIR -- do not search for .do above that directory
-                  (it can contain .redo/top as an alternative)`)
+                  (it can contain .redo/top as an alternative)
+  REDO_INODE_NO_TRUST -- do not trust inode information (except for size)
+                         and always check file's hash`)
 }