diff --git a/Objects/bytearrayobject.c b/Objects/bytearrayobject.c
index 7a7410405ec..0b45394a4af 100644
--- a/Objects/bytearrayobject.c
+++ b/Objects/bytearrayobject.c
@@ -1102,7 +1102,7 @@ PyDoc_STRVAR(find__doc__,
 "B.find(sub[, start[, end]]) -> int\n\
 \n\
 Return the lowest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+such that sub is contained within B[start,end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -1172,7 +1172,7 @@ PyDoc_STRVAR(rfind__doc__,
 "B.rfind(sub[, start[, end]]) -> int\n\
 \n\
 Return the highest index in B where subsection sub is found,\n\
-such that sub is contained within s[start,end].  Optional\n\
+such that sub is contained within B[start,end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
diff --git a/Objects/bytesobject.c b/Objects/bytesobject.c
index 38458ef9a6e..8e35fa92769 100644
--- a/Objects/bytesobject.c
+++ b/Objects/bytesobject.c
@@ -1273,7 +1273,7 @@ PyDoc_STRVAR(find__doc__,
 "B.find(sub[, start[, end]]) -> int\n\
 \n\
 Return the lowest index in B where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within B[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -1312,7 +1312,7 @@ PyDoc_STRVAR(rfind__doc__,
 "B.rfind(sub[, start[, end]]) -> int\n\
 \n\
 Return the highest index in B where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within B[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
diff --git a/Objects/unicodeobject.c b/Objects/unicodeobject.c
index 03807a45b9d..75da0e7e8d2 100644
--- a/Objects/unicodeobject.c
+++ b/Objects/unicodeobject.c
@@ -7587,7 +7587,7 @@ PyDoc_STRVAR(find__doc__,
              "S.find(sub[, start[, end]]) -> int\n\
 \n\
 Return the lowest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");
@@ -8513,7 +8513,7 @@ PyDoc_STRVAR(rfind__doc__,
              "S.rfind(sub[, start[, end]]) -> int\n\
 \n\
 Return the highest index in S where substring sub is found,\n\
-such that sub is contained within s[start:end].  Optional\n\
+such that sub is contained within S[start:end].  Optional\n\
 arguments start and end are interpreted as in slice notation.\n\
 \n\
 Return -1 on failure.");