commit - b9771a80e68a3c46e901dec298d5f5b6dfe2654e
commit + ac1d11971d03e83da5072a2478225bb95fd541d9
blob - dbb598ef5f02c560b8cf0d20bf9c137143731c4b
blob + fd42643d39258a86b457995ad98f18740dc28336
--- man/man1/diff.1
+++ man/man1/diff.1
@@ -4,7 +4,7 @@ diff \- differential file comparator
 .SH SYNOPSIS
 .B diff
 [
-.B -cefmnbwr
+.B -acefmnbwr
 ] file1 ... file2
 .SH DESCRIPTION
 .I Diff
@@ -127,6 +127,9 @@ The
 .B -c
 option includes three lines of context around each
 change, merging changes whose contexts overlap.
+The
+.B -a
+flag displays the entire file as context.
 .PP
 Except in rare circumstances,
 .I diff