diff --git a/.github/workflows/check-docs.yml b/.github/workflows/check-docs.yml
index a5db7221e..c6f2ae116 100644
--- a/.github/workflows/check-docs.yml
+++ b/.github/workflows/check-docs.yml
@@ -19,4 +19,4 @@ jobs:
         id: lychee
         uses: lycheeverse/lychee-action@v2
         with:
-          args: "--verbose --no-progress --accept 200,203,503 --exclude-path ^target './**/*.md' './**/*.html'"
+          args: "--verbose --no-progress --accept 200,203,503 --exclude-path ^target --exclude-path ^book/404.html$ './**/*.md' './**/*.html'"
diff --git a/.lycheeignore b/.lycheeignore
index 8c3f75f3b..a1358272f 100644
--- a/.lycheeignore
+++ b/.lycheeignore
@@ -1,6 +1,9 @@
 # For some reason these spurious links appear in some cargo doc-generated files
 ^file://.+/MUSE2/book/api/index\.html$
 
+# Some of these links give a 404, even though they're generated in the API docs. No idea why.
+^https://docs.rs/erased-serde/
+
 # Times out on GitHub runner
 ^http://www.adobe.com
 
diff --git a/docs/model/investment.md b/docs/model/investment.md
index 2ee29bbaf..6dccf743a 100644
--- a/docs/model/investment.md
+++ b/docs/model/investment.md
@@ -3,10 +3,10 @@
 <!-- markdownlint-disable MD049 -->
 
 This section details the investment and asset retention decision process, which is applied within
-step 2 of the [overall MUSE2 workflow]. This process determines which new assets to build and
-which existing assets to retain to meet system needs over time. In the overall workflow, dispatch
-optimisation is used to identify *physical needs* by quantifying demand profiles for commodities of
-interest.
+step 2 of the [overall MUSE2 workflow][framework-overview]. This process determines which new assets
+to build and which existing assets to retain to meet system needs over time. In the overall
+workflow, dispatch optimisation is used to identify *physical needs* by quantifying demand profiles
+for commodities of interest.
 
 ## Commodity prices
 
@@ -23,7 +23,7 @@ the preceding MSY. When the `pricing_strategy` option is set to `scarcity_adjust
 shadow prices for each commodity adjusted to remove the impact of binding capacity constraints.
 
 Note: there is an option to iterate over each year so that investment decisions are based on
-equilibrium prices in the _current year_, in what's referred to as the "[ironing-out loop]".
+equilibrium prices in the _current year_, in what's referred to as the "[ironing-out loop][framework-overview]".
 In this case, \\( \lambda\_{c,r,t} \\) will reflect prices from previous iteration of the
 ironing-out loop.
 
@@ -203,6 +203,5 @@ For each asset option:
   AFC \* cap_r + \sum_{t} act_t \* AC_t \\)), divided by the annual output
   \\( \sum_t act_t \\).
 
-[overall MUSE2 workflow]: ./README.md#framework-overview
+[framework-overview]: https://energysystemsmodellinglab.github.io/MUSE2/model/index.html#framework-overview
 [Dispatch Optimisation Formulation]: ./dispatch_optimisation.md
-[ironing-out loop]: ./README.md#framework-overview