diff --git a/docs/superpowers/plans/2026-07-17-build-number-versioning.md b/docs/superpowers/plans/2026-07-17-build-number-versioning.md
index 489cfa0..e2f76c4 100644
--- a/docs/superpowers/plans/2026-07-17-build-number-versioning.md
+++ b/docs/superpowers/plans/2026-07-17-build-number-versioning.md
@@ -34,9 +34,9 @@ Spec: `docs/superpowers/specs/2026-07-17-build-number-versioning-design.md`
 - Unchanged (verified only): `AboutDialog.cpp`
 
 **Interfaces:**
-- Produces macros consumed by `TaskbarCalculator.rc2`: `VER_MAJOR`, `VER_MINOR`, `VER_BUILD` (from `version.h`) and `VER_BUILDNUM` (from generated `version_build.h`, fallback `0`).
+- Produces macros consumed by `TaskbarCalculator.rc2`: `VER_MAJOR`, `VER_MINOR`, `VER_FIX` (from `version.h`) and `VER_BUILDNUM` (from generated `version_build.h`, fallback `0`).
 - The MSBuild target `IncrementBuildCounter` produces `version_build.h` before `ResourceCompile`.
-- Runtime: `AboutDialog.cpp::GetAppVersionString()` already reads `HIWORD/LOWORD` of `FILEVERSION` → shows `VER_MAJOR.VER_MINOR.VER_BUILD` (`3.0.1`); field 4 stays invisible.
+- Runtime: `AboutDialog.cpp::GetAppVersionString()` already reads `HIWORD/LOWORD` of `FILEVERSION` → shows `VER_MAJOR.VER_MINOR.VER_FIX` (`3.0.1`); field 4 stays invisible.
 
 ---
 
@@ -50,7 +50,7 @@ Write `C:\Sources\TaskbarCalculator\version.h` with exactly:
 // Semantic version — edit these by hand (NOT in the VS resource editor).
 #define VER_MAJOR 3
 #define VER_MINOR 0
-#define VER_BUILD 1
+#define VER_FIX 1
 
 // Per-build counter. version_build.h is regenerated on every build by the
 // IncrementBuildCounter MSBuild target (BeforeTargets="ResourceCompile"), so it
@@ -75,13 +75,13 @@ Write `C:\Sources\TaskbarCalculator\TaskbarCalculator.rc2` with exactly:
 #define VER_STRINGIZE(x)  VER_STRINGIZE2(x)
 #define VER_VERSION_STR \
     VER_STRINGIZE(VER_MAJOR) "." VER_STRINGIZE(VER_MINOR) "." \
-    VER_STRINGIZE(VER_BUILD) "." VER_STRINGIZE(VER_BUILDNUM)
+    VER_STRINGIZE(VER_FIX) "." VER_STRINGIZE(VER_BUILDNUM)
 
 LANGUAGE LANG_NEUTRAL, SUBLANG_DEFAULT
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION    VER_MAJOR,VER_MINOR,VER_BUILD,VER_BUILDNUM
- PRODUCTVERSION VER_MAJOR,VER_MINOR,VER_BUILD,VER_BUILDNUM
+ FILEVERSION    VER_MAJOR,VER_MINOR,VER_FIX,VER_BUILDNUM
+ PRODUCTVERSION VER_MAJOR,VER_MINOR,VER_FIX,VER_BUILDNUM
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L
diff --git a/docs/superpowers/specs/2026-07-17-build-number-versioning-design.md b/docs/superpowers/specs/2026-07-17-build-number-versioning-design.md
index ff13ba8..911df0a 100644
--- a/docs/superpowers/specs/2026-07-17-build-number-versioning-design.md
+++ b/docs/superpowers/specs/2026-07-17-build-number-versioning-design.md
@@ -32,7 +32,7 @@ into a header by a pre-build MSBuild target.
 
 #define VER_MAJOR 3
 #define VER_MINOR 0
-#define VER_BUILD 1
+#define VER_FIX 1
 
 // Per-build counter. version_build.h is regenerated on every build by the
 // IncrementBuildCounter MSBuild target (BeforeTargets="ResourceCompile"), so it always
@@ -64,13 +64,13 @@ Holds the whole `VS_VERSION_INFO` block, built from the macros. Skeleton:
 #define VER_STRINGIZE(x)  VER_STRINGIZE2(x)
 #define VER_VERSION_STR \
     VER_STRINGIZE(VER_MAJOR) "." VER_STRINGIZE(VER_MINOR) "." \
-    VER_STRINGIZE(VER_BUILD) "." VER_STRINGIZE(VER_BUILDNUM)
+    VER_STRINGIZE(VER_FIX) "." VER_STRINGIZE(VER_BUILDNUM)
 
 LANGUAGE LANG_NEUTRAL, SUBLANG_DEFAULT
 
 VS_VERSION_INFO VERSIONINFO
- FILEVERSION    VER_MAJOR,VER_MINOR,VER_BUILD,VER_BUILDNUM
- PRODUCTVERSION VER_MAJOR,VER_MINOR,VER_BUILD,VER_BUILDNUM
+ FILEVERSION    VER_MAJOR,VER_MINOR,VER_FIX,VER_BUILDNUM
+ PRODUCTVERSION VER_MAJOR,VER_MINOR,VER_FIX,VER_BUILDNUM
  FILEFLAGSMASK 0x3fL
 #ifdef _DEBUG
  FILEFLAGS 0x1L