diff --git a/libc/malloc_debug/Config.cpp b/libc/malloc_debug/Config.cpp
index be577bc..77d2f02 100644
--- a/libc/malloc_debug/Config.cpp
+++ b/libc/malloc_debug/Config.cpp
@@ -409,7 +409,8 @@
 
 void Config::LogUsage() const {
   error_log("For malloc debug option descriptions go to:");
-  error_log("  https://android.googlesource.com/platform/bionic/+/master/libc/malloc_debug/README.md");
+  error_log(
+      "  https://android.googlesource.com/platform/bionic/+/main/libc/malloc_debug/README.md");
 }
 
 bool Config::GetOption(const char** options_str, std::string* option, std::string* value) {
diff --git a/libc/malloc_debug/README.md b/libc/malloc_debug/README.md
index fddc4a3..37fafa7 100644
--- a/libc/malloc_debug/README.md
+++ b/libc/malloc_debug/README.md
@@ -170,7 +170,7 @@
 overrides this option, and should not be used at the same time.
 
 This option can also be used in combination with other tools such
-as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/master/README.md)
+as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/main/README.md)
 to only get backtraces for sizes of allocations listed as being leaked.
 
 ### backtrace\_max\_size=ALLOCATION\_SIZE\_BYTES
@@ -183,7 +183,7 @@
 overrides this option, and should not be used at the same time.
 
 This option can also be used in combination with other tools such
-as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/master/README.md)
+as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/main/README.md)
 to only get backtraces for sizes of allocations listed as being leaked.
 
 ### backtrace\_size=ALLOCATION\_SIZE\_BYTES
@@ -192,7 +192,7 @@
 This option overrides the backtrace\_min\_size and the backtrace\_max\_size.
 
 This option can also be used in combination with other tools such
-as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/master/README.md)
+as [libmemunreachable](https://android.googlesource.com/platform/system/memory/libmemunreachable/+/main/README.md)
 to only get backtraces for sizes of allocations listed as being leaked.
 
 ### backtrace\_full
diff --git a/libc/malloc_debug/tests/malloc_debug_config_tests.cpp b/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
index bc7af6d..a911e76 100644
--- a/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
+++ b/libc/malloc_debug/tests/malloc_debug_config_tests.cpp
@@ -40,8 +40,9 @@
 };
 
 std::string usage_string(
-  "6 malloc_debug For malloc debug option descriptions go to:\n"
-  "6 malloc_debug   https://android.googlesource.com/platform/bionic/+/master/libc/malloc_debug/README.md\n");
+    "6 malloc_debug For malloc debug option descriptions go to:\n"
+    "6 malloc_debug   "
+    "https://android.googlesource.com/platform/bionic/+/main/libc/malloc_debug/README.md\n");
 
 TEST_F(MallocDebugConfigTest, unknown_option) {