diff --git a/docs/manual.txt b/docs/manual.txt
index 21decbcd..347112d5 100644
--- a/docs/manual.txt
+++ b/docs/manual.txt
@@ -4102,8 +4102,8 @@ OPTIONS
     “00002.png” etc., which can be changed by using the -o or --output option.
 
 --bg=COLOUR
-    Specify a background (paper) colour where COLOUR is in hex RRGGBB or RRGGGAA
-    format.
+    Specify a background (paper) colour where COLOUR is in hex RRGGBB or
+    RRGGBBAA format.
 
 --binary
     Treat input data as raw 8-bit binary data instead of the default UTF-8.
@@ -4214,7 +4214,7 @@ OPTIONS
 
 --fg=COLOUR
 
-    Specify a foreground (ink) colour where COLOUR is in hex RRGGBB or RRGGGAA
+    Specify a foreground (ink) colour where COLOUR is in hex RRGGBB or RRGGBBAA
     format.
 
 --filetype=TYPE
diff --git a/docs/zint.1 b/docs/zint.1
index 2883b233..a6eec709 100644
--- a/docs/zint.1
+++ b/docs/zint.1
@@ -73,7 +73,7 @@ be changed by using the \f[V]-o\f[R] or \f[V]--output\f[R] option.
 .TP
 \f[V]--bg=COLOUR\f[R]
 Specify a background (paper) colour where \f[I]COLOUR\f[R] is in hex
-RRGGBB or RRGGGAA format.
+RRGGBB or RRGGBBAA format.
 .TP
 \f[V]--binary\f[R]
 Treat input data as raw 8-bit binary data instead of the default UTF-8.
@@ -194,7 +194,7 @@ only).
 .TP
 \f[V]--fg=COLOUR\f[R]
 Specify a foreground (ink) colour where \f[I]COLOUR\f[R] is in hex
-RRGGBB or RRGGGAA format.
+RRGGBB or RRGGBBAA format.
 .TP
 \f[V]--filetype=TYPE\f[R]
 Set the output file type to \f[I]TYPE\f[R], which is one of
diff --git a/docs/zint.1.pmd b/docs/zint.1.pmd
index 64355846..5b80575f 100644
--- a/docs/zint.1.pmd
+++ b/docs/zint.1.pmd
@@ -44,7 +44,7 @@ Paintbrush (`PCX`), Portable Network Format (`PNG`), Scalable Vector Graphic (`S
     "00002.png" etc., which can be changed by using the `-o` or `--output` option.
 
 `--bg=COLOUR`
-:   Specify a background (paper) colour where *COLOUR* is in hex RRGGBB or RRGGGAA format.
+:   Specify a background (paper) colour where *COLOUR* is in hex RRGGBB or RRGGBBAA format.
 
 `--binary`
 :   Treat input data as raw 8-bit binary data instead of the default UTF-8. Automatic code page translation to an ECI
@@ -144,7 +144,7 @@ Paintbrush (`PCX`), Portable Network Format (`PNG`), Scalable Vector Graphic (`S
 
 `--fg=COLOUR`
 
-:   Specify a foreground (ink) colour where *COLOUR* is in hex RRGGBB or RRGGGAA format.
+:   Specify a foreground (ink) colour where *COLOUR* is in hex RRGGBB or RRGGBBAA format.
 
 `--filetype=TYPE`