diff --git a/g3doc/architecture_guide/platforms.md b/g3doc/architecture_guide/platforms.md
index b003eff3c..a4add1172 100644
--- a/g3doc/architecture_guide/platforms.md
+++ b/g3doc/architecture_guide/platforms.md
@@ -50,7 +50,7 @@ due to the overhead of nested virtualization.
 
 ### systrap
 
-The `systrap` platform relies `seccomp`'s `SECCOMP_RET_TRAP` feature in order to
+The `systrap` platform relies on `seccomp`'s `SECCOMP_RET_TRAP` feature in order to
 intercept system calls. This makes the kernel send `SIGSYS` to the triggering
 thread, which hands over control to gVisor to handle the system call. For more
 details, please see