diff --git a/docs/GLOSSARY.md b/docs/GLOSSARY.md
index f555cfcb..86ef2fcb 100644
--- a/docs/GLOSSARY.md
+++ b/docs/GLOSSARY.md
@@ -9,7 +9,7 @@ This glossary defines common terms relevant for the PHP AI Client and related pr
 * **Generative AI**: Overarching term describing AI models that generate content as requested in a prompt.
 * **Implementer API**: The API used by people that want to _implement_ AI features in their own software/products.
 * **MCP**: The "Model Context Protocol", a proposed standard for connecting AI assistants to the systems where data lives.
-* **Message**: A single message, either a user prompt, a model response, or a system prompt—optionally containing of multiple message parts.
+* **Message**: A single message, either a user prompt, a model response, or a system prompt—optionally consisting of multiple message parts.
 * **Message part**: A part of a message, such as a piece of text, a URL, a file, or a function call.
 * **Modality**: The type or format of input provided to, or output received from, an AI model. Examples include text, image, audio, and video.
 * **Model**: A specific AI model that supports arbitrary AI features and modalities. Examples include content generation, classification, embedding.